<?php
/**
 * Defines the editing form for the shortanswer question type.
 *
 * @copyright &copy; 2007 Jamie Pratt
 * @author Jamie Pratt me@jamiep.org
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package questionbank
 * @subpackage questiontypes
 */

/**
 * shortanswer editing form definition.
 */
class question_edit_shortanswer_form extends question_edit_form {
	/**
	 * Add question-type specific form fields.
	 *
	 * @param MoodleQuickForm $mform the form being built.
	 */
	function definition_inner(&$mform) {
		$menu = array(get_string('caseno', 'quiz'), get_string('caseyes', 'quiz'));
		$mform->addElement('select', 'usecase', get_string('casesensitive', 'quiz'), $menu);

		$mform->addElement('static', 'answersinstruct', get_string('correctanswers', 'quiz'), get_string('filloutoneanswer', 'quiz'));
		$mform->closeHeaderBefore('answersinstruct');

		$creategrades = get_grade_options();
		$gradeoptions = $creategrades->gradeoptions;
		$repeated = array();
		$repeated[] =& $mform->createElement('header', 'answerhdr', get_string('answerno', 'qtype_shortanswer', '{no}'));
		$repeated[] =& $mform->createElement('text', 'answer', get_string('answer', 'quiz'), array('size' => 54));
		$repeated[] =& $mform->createElement('select', 'fraction', get_string('grade'), $gradeoptions);
		$repeated[] =& $mform->createElement('htmleditor', 'feedback', get_string('feedback', 'quiz'),
								array('course' => $this->coursefilesid));

		if (isset($this->question->options)){
			$countanswers = count($this->question->options->answers);
		} else {
			$countanswers = 0;
		}
		if ($this->question->formoptions->repeatelements){
			$repeatsatstart = (QUESTION_NUMANS_START > ($countanswers + QUESTION_NUMANS_ADD))?
								QUESTION_NUMANS_START : ($countanswers + QUESTION_NUMANS_ADD);
		} else {
			$repeatsatstart = $countanswers;
		}
		$repeatedoptions = array();
		$mform->setType('answer', PARAM_RAW);
		$repeatedoptions['fraction']['default'] = 0;
		$this->repeat_elements($repeated, $repeatsatstart, $repeatedoptions, 'noanswers', 'addanswers', QUESTION_NUMANS_ADD, get_string('addmoreanswerblanks', 'qtype_shortanswer'));

	}

	function set_data($question) {
		if (isset($question->options)){
			$answers = $question->options->answers;
			if (count($answers)) {
				$key = 0;
				foreach ($answers as $answer){
					$default_values['answer['.$key.']'] = $answer->answer;
					$default_values['fraction['.$key.']'] = $answer->fraction;
					$default_values['feedback['.$key.']'] = $answer->feedback;
					$key++;
				}
			}
			$default_values['usecase'] =  $question->options->usecase;
			$question = (object)((array)$question + $default_values);
		}
		parent::set_data($question);
	}
	function validation($data, $files) {
		$errors = parent::validation($data, $files);
		$answers = $data['answer'];
		$answercount = 0;
		$maxgrade = false;
		foreach ($answers as $key => $answer) {
			$trimmedanswer = trim($answer);
			if ($trimmedanswer !== ''){
				$answercount++;
				if ($data['fraction'][$key] == 1) {
					$maxgrade = true;
				}
			} else if ($data['fraction'][$key] != 0 || !html_is_blank($data['feedback'][$key])) {
				$errors["answer[$key]"] = get_string('answermustbegiven', 'qtype_shortanswer');
				$answercount++;
			}
		}
		if ($answercount==0){
			$errors['answer[0]'] = get_string('notenoughanswers', 'quiz', 1);
		}
		if ($maxgrade == false) {
			$errors['fraction[0]'] = get_string('fractionsnomax', 'question');
		}
		return $errors;
	}
	function qtype() {
		return 'shortanswer';
	}
}
?>